帮助从文本框到列表框进行计算 [英] Help in getting calculation from textbox to listbox

问题描述

我希望有人可以帮助我。我是C＃的新手，我的任务是完成任务。这涉及为将在主窗体中显示的计算类提供代码。文本输入文本框并显示在 列表框。数字
由按键事件填充，以在列表框中显示为列表。按＃按钮将显示小计和= 总计。

I hope someone can help me. I'm very new in C# and has been tasked to do an assignment. This involves witing a code for a calculation class that will show in the mainform. The text is entered in a Textbox and displayed in  listBox. Numbers are populated by a keypress event to appear as a list in the listbox. Pressing the # button will give the subtotal and = the Total.

它将如下所示。关于如何做到这一点的任何意见都将受到高度赞赏。提前致谢。

It will look like the below. Any inputs on how I can do this will be greately appreciated. Thanks in advance.

推荐答案

这是一个基本模式，用于总计和注释我没有使用已经存在的文本框事件。请注意确定什么是子总数。

Here is a basic pattern to work from for total and note I did not use textbox events as you have that already. Note sure what constitutes sub total.

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (!string.IsNullOrWhiteSpace(textBox1.Text))
            {
                int value = 0;
                if (int.TryParse(textBox1.Text, out value))
                {
                    listBox1.Items.Add(value);
                }
            }
        }
        private void button2_Click(object sender, EventArgs e)
        {
            var data = from item in listBox1.Items.Cast<string>() select Convert.ToInt32(item);
            label1.Text =

" Sum：{data.Sum（）}" ;;
}
}
}

"Sum: {data.Sum()}"; } } }

这篇关于帮助从文本框到列表框进行计算的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！